Analyze Collected Data

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Using the collected data

After the tracepoint experiment ends, you use GDB commands for
examining the trace data.  The basic idea is that each tracepoint
collects a trace "snapshot" every time it is hit and another snapshot
every time it single-steps.  All these snapshots are consecutively
numbered from zero and go into a buffer, and you can examine them
later.  The way you examine them is to "focus" on a specific trace
snapshot.  When the remote stub is focused on a trace snapshot, it will
respond to all GDB requests for memory and registers by reading from
the buffer which belongs to that snapshot, rather than from _real_
memory or registers of the program being debugged.  This means that
*all* GDB commands (`print', `info registers', `backtrace', etc.) will
behave as if we were currently debugging the program state as it was
when the tracepoint occurred.  Any requests for data that are not in
the buffer will fail.